Spark arrester for cupolas or the like



Patented Apr. 10, 1928.

UNITED STATES PATENT OFFICE.

SPARK ARRESTER FOR CUPOLAS OR THE LIKE.

Application filed July 13, 1926, Serial No. 122,198, and in Great Britain September 28, 1925.

This invention comprises certain improve ments in spark arresters tor cupolas or the like, and ithas for its object an improved construction which will efficiently )revent sparks or red hot matter passing into the atmosphere.

According to the present improven'ients, the spark arr-ester comprises a cover which seals the top of the cupola chimney which has a number of lateral. ports. These ports comn'iunicate with a. collecting chan'iber or chambers on the outer side of the enpola chimney, the gases passing by way of ports or openings to compartments or passages open to the atmosphere. The collecting chambers form expansion chambers which reduce the velocity of the gases and assist the deposition of the solid matter. The gases also pass downwardly in the collecting chamber and lead to the compartment or passage opening to the atmosphere in a direction preferably at right angles to the direction of entry from the cnpola chimney.

Referring to the drawings r- Figure l is a central vertical sectional view of a spark arr-ester constructed according to this invention.

Figure 2 is a plan View, and

l igure 3 is a perspective View with av portion of the from broken away for convenience of illustration.

J-\cc0rding to one form of the invention, the top of a. cupola chimney 1 is closed by a dome-shaped member 2 coi'nprising a steel plate lined on the inside with fire bricks. Four ports 3 are formed in the wall of the chimney 1 near the upper end. and such ported part oi. the chimney is surrounded by a cylindrical chamber or casing l which is divided by radial walls or partitions 5 into eight conipartmcnts. Four of the com" partments 6 forming the collecting chamhers. comn'iunicate direct with the cupola through the said ports 3. The partitions 5, separating these collecting chambers 6 from the adjacent: outlet con'ipartments 7. down to a. distance short of the bottom of the said cylindrical casing. so that a communication passage or port 8 between the chamhers is made under the partitions. The gases will pass through the said ports 3 down the spark arresting chambers 6 and under the partitions 5 to the adjacent outlet compartments 7, the roofs of which are open to the atmosphere. All the steel work is lined With fire bricks so that effective protection is given against the hot gases.

Solid matter will strike the dome shaped cover 2, and will fall back into the cupola. The gases passing from the cupola chimney and any red hot matter carried thereby will enter the collecting chambers 6 and the solid matter will strike the Walls and drop on the bottom, the arresting ofthe sparks being also assisted by the downward movement oi the gases in the collecting chambers. The gases will then pass under the partitions 5 forming the sides of the arresting chambers into the outlet compartments 7 and thence into the atmosphere. The chambers 6 have the effect of expansion chambers and lecrease the velocity of the gases without producing a back pressure detrimenially alfecting the efficiency of the cupola. The ports 3 are of a greater area than the ports or passage 8, and the outlet of the cmnpartments 7 are of a greater area than the port or passage 8 thereby assisting the escape of the gases. The decrease of the velocity oi? flow in the chambers 6 assists in trapping solid particles in such chambers. In the torn) illustrated the gases also pass out from the chambers 6 at right angles to the direction oil entry through the ports 3, thereby iurther assisting the trapping of solid matter. Doors 9 are fitted in the outer Wall of the collecting chambers in order to enable the deposited matter to be readily removed.

I claim:

A spark arrester comprising a cover sealing the top of a chimney. an annular member located around the chimney comprising a wall spaced from the chimney, and having a bottom passing from the wall to the chin ney, radial walls dividing the annular member into compartments,v such walls passing to a short distance from the said bottom, roots for the top oi each alternate compartment, said chimney having ports leading into the upper end of each said alternate compartment provided with a root. whereby gases will pass into the rooted compartments and then under the radial walls into the other compartments.

In witness whereof have signed this specification.

PERCY PRITOHARD. 

